Who is Edward Page from Total Control and what is their importance?

Brother of Jeff Page, Edward operates his own private investigation firm. When Jeff's brother dies, Edward is convinced that, despite the medical examiner's findings, he was murdered. He is following Arthur Lieberman because his brother and Lieberman had had an affair, and he believes Lieberman was somehow involved in his brother's death. Page was at the airport the morning of the plane crash and observed the identity switch between Jason and the stranger.